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Emuprom

agkaminski·emuprom

Emuprom PCB layout, top view — open source AVR/Arduino board by agkaminski

About the Emuprom PCB

Emuprom is an open source AVR/Arduino PCB design by agkaminski, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 88.3 × 68.6 mm, with 34 components from 14 distinct parts.

Its main chip is the ATMEGA8-16P, from the AVR/Arduino family. Other key parts include the CY62256-70PC, 74HC244, 74HC32, 74HC373 and CH340N. By type, the board carries 13 capacitors, 11 ICs, 6 resistors and 4 connectors.

From the project

DIY 27C256 EPROM emulator

Revision D has been verified and it is working as intended (working both with TL866 EPROM programer and FellaPC computer).

Crude cable schematic, top view (should be enough to be able to make this cable):

Sanity check - EPROM GND (pin \#14) should be on the one before last wire (bottom of the picture).

- ? - help - ! - claim bus, memory edit, assert /RST - . - release bus, deassert /RST - @ - set address mode - \# - set data mode - = - dump 256 bytes @addres - t - memory test - \+ - echo on - \- echo off - m - calculate md5 sum - s - clear memory (all 0xff) - r - reset target (pulse /RST)

Emuprom, from the project README
From the project README

Main components on the Emuprom

CY62256-70PC74HC24474HC32ATMEGA8-16P74HC373CH340N74HC02

Emuprom bill of materials (BOM)

34 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CY62256-70PC
U1
4
74HC244
U2, U3, U4, U10
1
74HC32
U5
1
ATMEGA8-16P
ATmega8-16P
U6
2
74HC373
U7, U9
1
CH340N
U8
1
74HC02
U11
1
CONN_02X20_ODD_EVEN
Conn_02x20_Odd_Even
J1
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J2
1
USB_C_RECEPTACLE_USB2.0_14P
USB_C_Receptacle_USB2.0_14P
J3
1
CONN_01X02
Conn_01x02
J4
13
100N
100n
C1, C2, C3, C4, C5, C6, C8, C9 +5
4
10K
R1, R4, R5, R6
2
1K5
R2, R3

Emuprom design files

The KiCad project lives in the agkaminski/emuprom repository on GitHub; these links point at the commit this page was built from.

Emuprom: common questions

What microcontroller does the Emuprom use?

The Emuprom is built around the ATMEGA8-16P, from the AVR/Arduino family.

How big is the Emuprom PCB?

The Emuprom measures 88.3 × 68.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Emuprom?

34 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Emuprom design files?

From the agkaminski/emuprom repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Emuprom design in my own project?

Yes, under the terms of its CC0-1.0 license, which agkaminski chose for the repository.

Can I test firmware for the Emuprom without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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